Tool-holder for grindstqmes



(No Model.)

J. M. DILLON.

TOOL HOLDER FOR GRINDSTONES. No. 388,958. 2 nted Sept. 4, 1888,

W ATTORNEYS.

UNTTED STATES PATENT @rrrcs.

JAMES M. DILLON, OF. POIJ'GHKEEPSIE, NFAV YORK.

TOOL=HOLDER FOR GRlNDSTONES.

SPECIFICATION forming part of Letters Patent No. 388,958, dated September 4, 1888.

Application filed February 17, 1888. Serial No. 264.349.

To all whom 52 may concern.-

Be it known that I, Janus M. DILLON, of Poughkeepsie, in the county of Dutchess and State of New York, have invented a new and Improved Toold lolder for' Grindstones, of which the following is a full, clear, and exact description.

My invention relates to an improved toolholder for grindstones, and has for its object to provide a means whereby a number of tools may be held at an angle and in rigid contact with the periphery of the stone and be raised therefrom at pleasure, and wherein the attachment will be simple, efficient, and durable, and capable of manufacture at a moderate cost.

The invention consists in the construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to he had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of a grindstone having the device applied. Fig. 2 is a front elevation of the tool-holder, and Fig. 3 is an end view of the same. Fig. 4c is a front elevation of the base, and Fig. 5 is an end view thereof.

In carrying out the invention, A represents a grindstone, and A the frame thereof. A plate, B, preferably segmental, is secured over each bearing upon the frame, from which plates a series of radial arms, I), are projected, the arms upon both sides of the stone being in parallel planes and sufficiently long to pro j out beyond the periphery of the stone, as best shown in Fig. 1.

The holder proper consists, essentially, of three partsnainely, the base D, the pivoted body or holder D, and the sliding tool-clamp D.

The base D consists of a bar, d, of a length slightly greater than the width of stone at the periphery, the ends (2' of which bar, projecting at right angles from the side, are provided with spaced lugs (l in like plane with the bar and a thumb-screw, (2 passing through one lug at each end of the bar. The upper side edges of the end pieces (1 are made to overhang the base, which overhanging parts are (No model.)

respectively aperturcd, as best illustrated in Fig. 5.

The body or holder D consists of four bars of equal length-two upper bars, 6, and two lower bars, e-united by end pieces 0 The end pieces are provided with a central recess, 6", in their upper edges of a width preferably equal to the space intervening the upper bars, but widened below the bars, as shown, whereby the approaching smooth surfaces of the said upper bars form ways, as best illustrated in Fig. 3. The lower bars, a, are wider than the upper bars, having flat upper faces, as shown in dotted lines, Fig. 8, adapted to support the tool to be sharpened. The end pieces 6 are pivoted centrally at their base to the upper forward end projections of the base proper of the device, and the contiguous edges of the said base D and the body or holder D are recessed in such manner as that the latter may have an easy rocking movement upon the former.

The end pieces of the body or holder are provided at the bottom rear corner with an outwardly and upwardly inclined projection, It, provided at or near the extremity with an aperture and a pin, It, andthe said projection 7t and the similar projection upon the base D have secured thereto the respective members of an essentially U-shaped spring, K, which spring normally gives the body a forward inclination, as shown in Fig. 1.

In order that the body may beheld horizontally, a catch, M, is pivoted to the rearward extension of the base, adapted to engage the aforesaid body-pin 7;.

To complete the device, the toolclamp D consisting of a rectangular block grooved to receive the inner faces of the upper bars, 6, is placed in contact with said bars to slide thereon, and a thumb-screw, h, is entered a threaded aperture extending vertically and preferably centrally through the block, as illustrated in Figs. 2 and 3.

In operation the base D is placed transversely above the periphery of the stone and secured to one set of the radial arms I) by means of the setscrews. The tool to be ground (in this instance a granite-cuttefis tool) is placed transversely upon the lower bars, 6, the clamp ing-block brought over it, and the set-screw it made to engage the tool and bind it in place. The catch M is withdrawn from the pin 7c',and the body thereupon is inclined forwardly by the spring K, causing the cutting-edge of the tool to rest and bear firmly upon the grind stone, A rotary motion being given the stone, the tool is ground as required. The tool being ground sufficiently, the body is thrown back, the catch at engaged with the pin it, the tool being thereby held above the stone for examination, manipulation, or removal.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with segmental plates adapted for attachment to a grindstoneframe provided with radial arms, a base-plate hav- 1 ing lugs embracing the arms, and a set-screw passing through said lugs, and a body pivoted to rock upon the base provided with toolsupporting bars, and parallel ways above said bars, of a clamping-block sliding in said ways, substantially as shown and described.

2. The combination, with segmental plates adapted for attachment to a grindstonc-framc provided with radial arms, a base-plate having lugs embracing the arms, and a set'screw passing through said lugs, and a body pivoted to rock upon the base provided with toolsupporting bars, and parallel ways above said bars, of a clamping-block sliding in said ways, springs connecting the base and body at the ends upon one side, and catches pivoted upon the base engaging a projection upon the body,

J AMES M. DILLON.

\Vitnessrs:

MARTIN L. BEUTELL, GEORGE W. MYERS. 

